2024 Residential Plans Examiner – Practice Quiz (Untimed)

2024 Residential Plans Examiner (R3) (Untimed)

60 Questions

2 Hours

1 / 60

1. Each length of pipe, pipe fitting, trap, and fixture must bear what identification?

A) The date of manufacture

B) The identification of the manufacturer

C) The name of the installer

D) The rating pressure

2 / 60

2. What is the maximum allowable span for a 2×12, #2 grade Douglas fir-larch rafter spaced 16 inches apart, with a dead load of 10 psf, ceiling attached, and a roof live load of 50 psf?

A) 17'-8"

B) 18'-5"

C) 19'-6"

D) 17'-9"

3 / 60

3. Plumbing fixtures, faucets, and fixture fittings must have smooth impervious surfaces, be free from defects, and meet which other criteria regarding surfaces?

A) Be metallic

B) Be easily removable

C) Shall not have concealed fouling surfaces

D) Be corrosion-resistant

4 / 60

4. Horizontal branches shall connect to the bases of stacks at a point located not less than how many times the diameter of the drainage stack downstream from the stack?

A) 10 times the diameter

B) 8 times the diameter

C) 5 times the diameter

D) 9 times the diameter

5 / 60

5. What is the minimum height of a guardrail required for decks more than 30 inches above grade?

A) 36 inches

B) 30 inches

C) 42 inches

D) 34 inches

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6. In mechanically ventilated indoor locations for hydrogen-generating appliances, where must equipment with ignition sources be located?

A) Below the mechanical ventilation outlet(s)

B) Directly beneath hydrogen-generating units

C) At least 12 inches from any wall

D) Above the appliance to allow heat to rise

7 / 60

7. Which of the following materials is approved for use in a condensate disposal system?

A) Lead

B) Black iron

C) Rigid aluminum

D) Cross-linked polyethylene (PEX)

8 / 60

8. What is the minimum required guard height for a residential balcony?

A) 48 inches

B) 42 inches

C) 30 inches

D) 36 inches

9 / 60

9. If a space is provided for a clothes dryer but one is not yet installed, what must be done with the exhaust duct in that space?

A) Extend it to the attic and secure with flashing

B) Cap or plug the duct and clearly label it for “future use”

C) Leave it open for inspection by the code official

D) Connect it to the HVAC system

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10. Which of the following fixtures shall NOT be served by a combination waste and vent system?

A) Drinking fountains.

B) Sinks.

C) Water closets.

D) Floor drains.

11 / 60

11. For the Standard Reference Design (SRD) calculation, what solar reflectance and emittance values must be assigned to the roof?

A) Solar reflectance = 0.25 and Emittance = 0.90

B) Solar reflectance = 0.55 and Emittance = 0.75

C) Solar reflectance = 0.70 and Emittance = 0.85

D) Solar reflectance = 0.25 and Emittance = 0.25

12 / 60

12. What is the vertical reinforcement requirement for an 10-inch plain masonry foundation wall with 9 feet of unsupported wall height, 8 feet of unbalanced backfill, and ML soil?

A) No. 5 bars at 48 inches o.c.

B) No. 6 bars at 24 inches o.c.

C) No. 6 bars at 40 inches o.c.

D) No. 6 bars at 56 inches o.c.

13 / 60

13. What is the required slope of ground surfaces for site drainage away from a foundation?

A) 2%

B) 10%

C) 5%

D) 1:10

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14. The device that controls the operation of an electrically operated pool cover must be located so that the operator has which of the following?

A) Full view of the pool

B) The ability to operate the device remotely

C) Access to the main electrical disconnect

D) A clear path to the pump motor

15 / 60

15. The outlet of a drain valve installed on a tank-type water heater must be provided with what type of connection?

A) A soldered connection

B) A male hose thread

C) A compression fitting

D) A quick-connect fitting

16 / 60

16. What is the minimum required trap size (diameter) for a clothes washer standpipe?

A) 1 1/2 inches

B) 3 inches

C) 2 inches

D) 1 1/4 inches

17 / 60

17. How is a conflict between a referenced code and the IRC resolved?

A) Whichever code is most restrictive applies

B) The referenced code applies only if the IRC is silent on the matter

C) The referenced code always applies

D) The IRC takes precedence

18 / 60

18. Duct systems must be constructed of materials having a flame spread index of no greater than:

A) 200

B) 150

C) 75

D) 25

19 / 60

19. Under wind pressures greater than 30 psf, vinyl exterior soffit panels must be fastened at both ends to which of the following?

A) The wall sheathing

B) The soffit edge itself

C) Foam insulation

D) Supporting components like nailing strips or fascia

20 / 60

20. How far must the galvanized metal tie extend beyond the opening when reinforcing a notched or drilled top plate?

A) 3 inches

B) 8 inches

C) 6 inches

D) 12 inches

21 / 60

21. Where is it prohibited to locate an exterior air intake for combustion air?

A) Within a garage or basement

B) Within 10 feet of a window

C) In an attic space ventilated with outdoor air

D) Above the roof deck

22 / 60

22. What is the minimum footing size (width × thickness in inches) required for a 3-story light-frame with brick veneer crawl space structure with a 50 psf roof live load and 2,000 psf soil bearing capacity?

A) 16 × 6

B) 19 x 7

C) 21 x 7

D) 20 x 8

23 / 60

23. Which backflow prevention device is permitted to be installed where subject to continuous pressure conditions but is prohibited if hazardous chemical additives are introduced downstream?

A) Double-Check Backflow Prevention Assembly

B) Backflow Preventer With Intermediate Atmospheric Vent

C) Reduced Pressure Principle Backflow Prevention Assembly

D) Pressure Vacuum Breaker Assembly

24 / 60

24. What standard must be used to verify the material identification of load-bearing cold-formed steel roof framing members?

A) AISI S240, Section A5.5

B) AISI S230, Section A4.4

C) AISI S240, Section A3

D) AISI S230, Section A4.3

25 / 60

25. Which statement is correct regarding the use of structural reinforcing steel for pools, spas, and hot tubs as a grounding electrode?

A) It is not permitted as a grounding electrode

B) Reinforcement of pools and spas is permitted as a grounding electrode

C) It is permitted as long as it meets the provisions of a concrete-encased electrode

D) If within 20 feet of the service panel, it is always permitted

26 / 60

26. In soils other than Group I, what is the minimum required size of a sump used to drain the porous layer and footings in wood foundations?

A) 18 inches (457 mm) in diameter

B) 24 inches (610 mm) in diameter or 20 inches (508 mm) square

C) 12 inches (305 mm) square

D) No specific size requirement, as long as it provides adequate drainage

27 / 60

27. Which of the following must be listed in accordance with UL 378 and locked into position before use?

A) Barometric damper

B) Draft hood

C) Balancing baffle

D) Automatic vent damper

28 / 60

28. What is the minimum required bearing length for deck beams on concrete or masonry?

A) 1 inch (25 mm)

B) 4 inches (102 mm)

C) 3 inches (76 mm)

D) 1 ½ inches (38 mm)

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29. What is the minimum required headroom for a stairway?

A) 7 feet

B) 7 feet 6 inches

C) 6 feet 8 inches

D) 6 feet 6 inches

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30. What is the required minimum net clear opening height for an emergency escape and rescue opening?

A) 22 inches

B) 26 inches

C) 24 inches

D) 20 inches

31 / 60

31. The disconnecting means for a motor-operated appliance rated over 1/8 horsepower shall have an ampere rating of not less than ____ of the motor’s full-load current rating, unless a listed unfused motor-circuit switch with a horsepower rating not less than the motor is used.

A) 125 percent

B) 100 percent

C) 115 percent

D) 80 percent

32 / 60

32. What is the allowable ampacity of a 10 AWG copper conductor with 75°C insulation?

A) 45 amps

B) 30 amps

C) 35 amps

D) 40 amps

33 / 60

33. If a building exceeds the applicability limits, which standard can be used for the design and construction of cold-formed steel wall framing?

A) AISI S250

B) AISI S230

C) AISI S240

D) AISI S220

34 / 60

34. What is the maximum allowable height difference between the threshold of an egress door and the landing inside?

A) 1½ inch

B) ¾ inch

C) 1 inch

D) ¼ inch

35 / 60

35. When combustion air is supplied entirely by a mechanical system, what is the minimum required rate of outdoor air supply?

A) 0.40 cfm per 1,000 Btu/h

B) 0.30 cfm per 1,000 Btu/h

C) 0.25 cfm per 1,000 Btu/h

D) 0.35 cfm per 1,000 Btu/h

36 / 60

36. What must be provided for unsupported edges of sanded plywood combination subfloor underlayment when installed continuously over two or more spans?

A) Adhesive bonding of all seams

B) A minimum of 1-inch spacing between sheets

C) A double layer of plywood

D) Tongue-and-groove joints or blocking

37 / 60

37. What is the minimum required width for a stair landing?

A) Width of flight served

B) 36 inches

C) Whichever is greater of width of flight served or 36 inches

D) 42 inches

38 / 60

38. What is the maximum spacing for intermediate balusters in a guard?

A) 5 inches

B) 4 inches

C) 6 inches

D) 6 inches

39 / 60

39. Service heads on raceways or service-entrance cables must be located above the point of attachment of the overhead conductors unless impracticable, in which case they may be no more than how many inches from the point of attachment?

A) 12 inches

B) 36 inches

C) 24 inches

D) 18 inches

40 / 60

40. In a dwelling unit laundry area, what is the minimum number of receptacle outlets required?

A) One for each appliance

B) At least two

C) None are required

D) At least one

41 / 60

41. What modification is prohibited on the flanges and lips of load-bearing cold-formed steel roof framing members?

A) Bending for alignment

B) Cutting or notching

C) Drilling holes larger than 1 inch

D) Welding stiffeners

42 / 60

42. Access or egress from working space is considered impeded if simultaneously opened equipment doors reduce the working space width and height to less than:

A) 24 inches wide and 6.5 feet high

B) 36 inches wide and 6.5 feet high

C) 24 inches wide and 6 feet high

D) 30 inches wide and 6.5 feet high

43 / 60

43. What is the maximum overcurrent protection device rating for an 8 AWG aluminum conductor?

A) 20A

B) 35A

C) 30A

D) 25A

44 / 60

44. For asphalt shingle underlayment, how far must end laps be offset between courses?

A) 12 inches

B) 6 feet

C) 3 feet

D) No minimum offset required

45 / 60

45. Combustion air for solid fuel-burning appliances must be provided in accordance with:

A) The appliance manufacturer’s installation instructions

B) NFPA 31

C) Chapter 24 of the IRC

D) Section M1601

46 / 60

46. What is the maximum allowed plan dimension for buildings constructed with exterior concrete walls under the IRC?

A) 50 feet (15 240 mm)

B) 60 feet (18 288 mm)

C) 70 feet (21 336 mm)

D) 40 feet (12 192 mm)

47 / 60

47. What is the minimum required egress width between two handrails for a stairway?

A) 32 inches

B) 36 inches

C) 27 inches

D) 34 inches

48 / 60

48. What is the minimum depth of a landing at the top and bottom of a stairway?

A) 24 inches

B) 36 inches

C) 42 inches

D) 30 inches

49 / 60

49. What is the minimum required ventilation area for under-floor spaces unless an exception applies?

A) 1 square foot for each 200 square feet of under-floor area

B) 1 square foot for each 50 square feet of under-floor area

C) 1 square foot for each 100 square feet of under-floor area

D) 1 square foot for each 150 square feet (0.0929 m² per 14 m²) of under-floor area

50 / 60

50. The sump pump, sump, and discharge piping must conform to the requirements of which set of code specifications?

A) P3301.1 only

B) P3303.1.1 through P3303.1.4

C) P3002.1 through P3003

D) P3302.1, P3302.2, and P3302.3

51 / 60

51. What is the minimum distance required between foundation anchor bolts?

A) 3 feet

B) 4 feet

C) 6 feet

D) 5 feet

52 / 60

52. Gas piping enclosed within framing members must be protected if located less than 1½ inches from the framing face unless what material is used?

A) Black steel or galv steel

B) Galvanized steel only

C) Plastic wrap

D) PVC conduit only

53 / 60

53. A device capable of being operated by personal intervention is defined as what?

A) Automatic

B) Continuous

C) Manual

D) Responsive

54 / 60

54. When an oil tank is abandoned or removed, what must be done with outdoor above-grade fill piping?

A) It may remain if capped

B) It must be sealed and labeled

C) It must be removed

D) It must be inspected and tested

55 / 60

55. What is the required minimum headlap for slate shingles on a roof with a slope of 6:12?

A) 2 inches

B) 5 inches

C) 4 inches

D) 3 inches

56 / 60

56. What is the minimum required landing depth at an exterior door?

A) 36 inches

B) 30 inches

C) 18 inches

D) 24 inches

57 / 60

57. For single-wall metal pipe connectors measuring over 10 through 16 inches in diameter for oil or solid fuel-burning appliances, what gauge number is required?

A) 22 gauge

B) 24 gauge

C) 28 gauge

D) 26 gauge

58 / 60

58. What is the minimum nominal thickness required for wood structural panel exterior soffits?

A) 3/8 inch

B) 1/2 inch

C) 5/16 inch

D) 1/4 inch

59 / 60

59. When must truss design drawings be submitted to the building official for approval?

A) Only if a change is made to the truss design

B) Before installation of the trusses

C) After trusses are installed

D) Before ordering the trusses from the manufacturer

60 / 60

60. When service conductors serve 100 percent of the dwelling unit load, the load shall be computed in accordance with:

A) Table E3501.5

B) Table E3704.2

C) Table E3902.11

D) Table E3602.2

Your score is

2024 Residential Plans Examiner – Practice Quiz (Untimed)

“This untimed practice quiz simulates the ICC exam format, giving you full exposure to real-style questions while allowing unlimited time to navigate, learn, and build confidence without time pressure.”